How high is too high? It depends on your expectations AND on your stabilizer levels. You can look at the Best Guess chart, linked in my signature. The "Shock+" levels tend to be irritating and drying to most people's skin. Shock levels are hard on swimsuits with Lycra.
But, I really doubt the vacuum device you have will help. More likely, you just need to hold the chlorine to "shock" levels, and brush the pool.
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